Here's a little glossary to help you decode the difference between all your Viagra options. (Note: Many of the drugs that say "Viagra" are actually generic Viagras, using the term, as it has now become, as a general word for ED treatment.) Studies are still in process in relation to the condition known as NAION (non-arteric anterior ischaemic optic neuropathy). So far very few cases have been linked between NAION and men taking PDE-5 Inhibitors such as Sildenafil Citrate (the active ingredient in Viagra), and studies have been inconclusive so far.

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